Hoped to find this in a search, since hundreds are flying...
Sec 26, pp 4 step 5, since VENT DL-03 and VA-175 tee have the same size tubing, how did everybody snuggle one inside of the other? Thought of a flute or two, or cutting a slot.
Just something to think about. Look around and see if you can find the mod to exit the heated air at the top of the tunnel while you're at this stage in the build. In the -10 there is no problem in getting heat but it's all at your feet in the back. I'm rather tall and with the pilot seat pushed back to where I like it, the heat exit is almost up under the seat. Then it's hard to get the heat up to the rear seat passengers.
I've seen where someone, not sure who, plumbed an additional outlet to the rear heat and put an eyeball vent at the top of the tunnel. Looks to me that this would be a great add that I'll look into adding in the future.
Just something to think about. Look around and see if you can find the mod to exit the heated air at the top of the tunnel while you're at this stage in the build.